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Experimental Study on the Effects of Water-in-Oil Emulsions to the Pressure Drop in Pipeline Flow

Authors: S. S. Dol, M. S. Chan, S. F. Wong, J. S. Lim


Emulsion formation is unavoidable and can be detrimental to an oil field production. The presence of stable emulsions also reduces the quality of crude oil and causes more problems in the downstream refinery operations, such as corrosion and pipeline pressure drop. Hence, it is important to know the effects of emulsions in the pipeline. Light crude oil was used for the continuous phase in the W/O emulsions where the emulsions pass through a flow loop to test the pressure drop across the pipeline. The results obtained shows that pressure drop increases as water cut is increased until it peaks at the phase inversion of the W/O emulsion between 30% to 40% water cut. Emulsions produced by gradual constrictions show a lower stability as compared to sudden constrictions. Lower stability of emulsions in gradual constriction has the higher influence of pressure drop compared to a sudden sharp decrease in diameter in sudden constriction. Generally, sudden constriction experiences pressure drop of 0.013% to 0.067% higher than gradual constriction of the same ratio. Lower constriction ratio cases cause larger pressure drop ranging from 0.061% to 0.241%. Considering the higher profitability in lower emulsion stability and lower pressure drop at the developed flow region of different constrictions, an optimum design of constriction is found to be gradual constriction with a ratio of 0.5.

Keywords: Constriction, pressure drop, turbulence, water cut, water-in-oil emulsions.

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[1] Duan, L., Jing, J.Q., Wang, J.Z., Huang, X.F., Qin, X.G., Qiu, Y.J., Study On Phase Inversion Characteristics of Heavy Oil Emulsions, 2010. International Society of Offshore and Polar Engineers. 83-84.
[2] Plasencia, J., Pettersen, B., & Nydal, O. J. Pipe flow of water-in-crude oil emulsions: Effective viscosity, inversion point and droplet size distribution, 2013. Journal of Petroleum Science and Engineering, 101, 35-43.
[3] Wong S.F., Law M.C., Samyadia Y., Dol S.S., 2015, Rheology study of water-in-crude oil emulsions, Chemical Engineering Transactions, 45, 1411-1416
[4] Omer, A. A., Pipeline Flow Behavior of Water-in-Oil Emulsions, 2009. University of Waterloo.
[5] Martínez-Palou, R., Reyes, J., Cerón-Camacho, R., Ramírez-de-Santiago, M., Villanueva, D., Vallejo, A. A., & Aburto, J., Study of the formation and breaking of extra-heavy-crude-oil-in-water emulsions—A proposed strategy for transporting extra heavy crude oils, 2015. Chemical Engineering and Processing: Process Intensification, 98, 112-122.
[6] Lim, J.S., Wong, S.F., Law, M.C., Samyudia, Y. & Dol, S.S. A Review on the Effects of Emulsions on Flow Behaviours and Common Factors Affecting the Stability of Emulsions, 2015. Journal of Applied Sciences, 15(2).
[7] Wong, S.F., Law, M.C., Samyudia, Y. & Dol, S.S. Rheology Study of Water-in-Crude Oil Emulsions, 2015. CHEMICAL ENGINEERING TRANSACTIONS, Vol. 45.
[8] Elobeid, M. O., Alhems, L. M., Al-Sarkhi, A., Ahmad, A., Shaahid, S. M., Basha, M., Ejim, C. E. Effect of inclination and water cut on venturi pressure drop measurements for oil-water flow experiments, 2016. Journal of Petroleum Science and Engineering.
[9] Mukhaimer, A., Al-Sarkhi, A., Nakla., E., M., A., & W. H., A.-H. L.. Pressure drop and flow pattern of oil–water flow for low viscosity oils: Role of mixture viscosity, 2015. International Journal of Multiphase Flow, 73, 90-96.
[10] Al-Yaari, M., Al-Sarkhi, A., Hussein, I., Abbad, M., Chang, F., & Abu-Sharkh, B. Pressure Drop Reduction of Stable Water-in-Oil Emulsion Flow: Role of Water Fraction and Pipe Diameter, 2013.
[11] Sumner, R. J., Hill, K. B., & Shook, C. A. (1998). Pipeline Flow of Heavy Crude Oil Emulsions. doi: 10.2118/98-01-08
[12] Wael H., A., Y. Ching, C., & Mamdouh, S. (2006). Pressure recovery of two-phase flow across sudden expansions. International Journal of Multiphase Flow, 33, 19.
[13] Gafonova, O. V., & Yarranton, H. W. (2001). The Stabilization of Water-in-Hydrocarbon Emulsions by Asphaltenes and Resins. Journal of Colloid and Interface Science, 241(2), 469-478.
[14] Hwang, C. J., & Pal, R. (1997). Flow of two-phase oil/water mixtures through sudden expansions and contractions. Chemical Engineering Journal, 68(2), 157-163.
[15] Balakhrisna, T., Ghosh, S., Das, G., & Das, P. K. (2010). Oil–water flows through sudden contraction and expansion in a horizontal pipe – Phase distribution and pressure drop. International Journal of Multiphase Flow, 36(1), 13-24.
[16] Davies, J. T. (1985). Drop sizes of emulsions related to turbulent energy dissipation rates. Chemical Engineering Science, 40(5), 839-842.
[17] Kourakos, V. G., Rambaud, P., Chabane, S., Pierrat, D., & J.M., B. (2009). Two-phase Flow Modelling Within Expansion and Contraction Singularities. 63, 17.
[18] Dol, S. S., Salek, M. M. & Martinuzzi, R. J., 2014, Effects of Pulsation to the Mean Field and Vortex Development in a Backward-Facing Step Flow. Journal of Fluids Engineering, 136(1).
[19] Dol, S. S., Salek, M. M. & Martinuzzi, R. J., 2014, Energy Redistribution Between the Mean and Pulsating Flow Field in a Separated Flow Region. Journal of Fluids Engineering, 136(11).